#include<stdio.h>

int main( void )
{
	double a,b, out;
	char c;
	scanf("%lf%lf",&a,&b);
	do
	{
		scanf("%c",&c);
	}
	while((c==' ')||(c=='\x0d')||(c=='\x0a') );
	switch(c)
	{
		case '+':
			out=a+b;
			break;
		case '-':
			out=a-b;
			break;
		case '*':
			out=a*b;
			break;
		case '/':
			out=a/b;
			break;
		default:
			;
	}
	printf("%.2lf\n",out);
	return 0;
}